Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Class of Stock [Line Items]
Trading Restriction Period	1 year
Common Stock [Member] | Insignificant Acquisitions [Member]
Class of Stock [Line Items]
Common stock issued during the period (in shares)	0	1,081,917
Common stock subscribed and issued (in shares)	0	183,926
Amount of common stock issued for acquisitions	$ 0	$ 5,636